TK-621, nicknamed "Omicron", was a clone stormtrooper in the Galactic Empire. Serving the Empire in the Stormtrooper Corps since 16 BBY, he was part of an experimental batch that initially had accelerated aging, but after reaching service age, slowed down and extended their lifespans. Though most clone stormtroopers were programmed to serve the New Order without question, his batch allowed more critical thinking. Nonetheless, Omicron carried out his orders well and had a reputation as a lethal shot. Along with that and his great strength, Omicron also possessed great tactical/strategical skills, and was promoted to Stormtrooper Commander because of it.